Superheater for scotch boilers



i. tol situa mais usual 'Panarea oct; 2, 192s.

" A fit-ssen UNITED STATE-sf PATENT lorrf'lCE-jL;

Josera Pommern or nnwrronn, N. Y.,

A c ortronerron or NEW Yoan.

sUr-nnnnernn non scoren Bormes.

Application ed February 28, 1924. SeriallNo. $95,679.

' f The primary object ofrny present invention iste provide a boiler of the Scotch vorv analogoustype with improved means tor super heating the steam generated. Further objects of the inyentiom'and `adyantages obtained from its use are set forth in theftollowng djescriptiv-e matten-in'which, and inthe accompanying drawings, l have described, and .illustrateda preferred embodiment oithe 1o invention, the 'various p v which V are 'pointed out with particularity in the claims annexed lto andyforming a ,part ,of this specicaticn.;

Fig. lis an elevati 1+f-l0fFg-35 i f Fig, 2 is a partial section on the line 5&2

of Fig.v l ;v and f on insection on .the line Fig,V 3 isa rear elevation.v In the drawings lvhave illustrated the'use of my' invention in a Vl coni'entionally' illus- -.trated wetback Scotch boiler provided with a vcentral combustion chamber B and two side combustion chambers B located withinfthe .boiler shell A. Each oi' the combustion chambersB and Bf comprises a horizontally Idisposed cylindrical body. portion and a com- @Minen-HB2, adjacent therear end of the boilerV To the front wall B3 of the compart- Vment B2 is secured the rear end ot' the corru- -gated metal cylinder :B10 which' forms the y -wallof the bodyportion of the combustion vchaurbr-ir.` `The usualtlue-tubes C are pro- -1 vided tcpasshot gases from each combustion i gsehamberftof he 'breeching l) 'leading to the V4boz'derstack` .The tubes are connected at their ,rear ends to the front :walls B3 of the y1 J0I11pa rtnrlentsB2, and `at their iront ends are connected into the-,front endwall of theboiler manner.. Thelboiler may beheated by the combustion of solid uelon .gratesin the cylindrical portions of the come l Jbustio'n chambers B and' B', or by the, combustion therein of oil vor gasin themsual mani ner, bi1t,as itheprorisions for ythuis heating` ,and the use or'v the present invention does not .depend on their I the boiler Aare well cknown,

exact character, they-are not illustrated inthe drawmgs. I' f Thesteamlgenerated by the-boiler is super- -heated ina superheaterlcomprising .elements F'located 'in'eachcompartinent B2; As shown, .the Vsuperlaterelements F, arearranged di y.rectly iin front eatures loi novelty of Vsection H, and

of :the-,upper portion .ofthe ,rear wall BfAr of eachcompartment B2, and.

in the preferred constructionillustrated, each .superheater elementY Fcomprises atube F2 Vhavinga'vertically diSposed-bodyportion and v f horizontallydisposed end portions which ,eX- tend horizontally throughthev corresponding chamber .wall B4 and .through the;y rear en d 'ronn Nnns', or BROOKLYN, New YORK, AssrsNon-'ro roeren wnsnnnncon;

col

loi the boiler :shell propenand through'stayv `tubes `G connecting those walls and-extending through the waterspace between them. The

,body portion-oit each tube F2 vis surrounded g by a casing diyid'ed transversely to the lengthvv ofthe tube into comparatively short sections and formed of metal blocks'F each havin-g a passage for the corresponding tubebody F2. The casingl sections Ff are advantageously Vi'ormed of cast iron `or `steel shrunk on the tubes F2, and advantageously some ot the sections F2 havesupporting bolts Fwelded- .to their rear sideswhich extend through the lrear wall. B? ot the corresponding. compartment B2 andthrough the rear wall of the boiler shell, where they are provided with nuts F4. The portions 1.0i these bolts tiaversing the water v'space between the -reark .eiid'of the boiler shell ,and the `corresponding 'wall 'B4 are surrounded by stay tubes G. v-rious casing sections'F unite to ormaheavy v metallic wall lining the upper lportion A.of thei yrear wall B4V of ythe corresponding` compartj Therament B2,V As shown, the lower portion'iof the rear Vwall BA2 of each compartment yB2 is provided with a tire brick lining E, butthisj p may ybe omitted it desired.

nected are divided Yinto sections H, il', 'H2

shown, the headers to which `the' end I yportions ofthe superheater .tubes F2.are con :and H3, supported ley-brackets Isecured .to I

the rear lend lof the boiler shell. ends of the tubes'F2 for one of the side compartments B2 are connected into the header the lower ends .ofthe .tubes F2, as well as the lower kends of the tubes F2 for, the central .compartment B2, are con;

nected to the header section H. y:The header H has one endclosed'andhas itslotherendl `connected-to the boiler steam pipe A while the h'ea'derH is'closed at both. ends. The

upper ends of. the tubes'F2 VVoi the elements `F l in the central compartment B2are connected A to theheader section'H2, to. which are'also connectedthe upperiendsofthe' tubes2 for at thelopposite side of the boilerdreni ,that at which the header-'Tl the `compartm ent B2 is located. The lower ends of the last men- Y tione'd tubes F2 yare connected to the header through the tubes F 2 i the steam pipe A will ordinarilybe to a safety valve (not illustrated).

Y fdischarge end L2 ao.

-drical portion of the combustion chamber B to each of the header sections H and p section H3. lBoth ends of the lheader section @tions H and H2imay well be provided with v valved drain coiinectionsfM,Y as shown, and connected Piping K shown as comprising a separate branch containing a cut-off valve K leading H2, connects the latterfto the interior of the boiler shell above the water level therein! Piping yL, including a separate branch containing va cut-off valve L leading to each of the header sections H and H2, connects the latter to the `interior-of the boiler shell adjacent :the bot Advantageously the tom of the Water space.

of the piping L opens to the Water space of theV boiler beneath the cylinat a point intermediate the ends of the latter. V InV the contemplatedfnorinal operation of the superheater boiler illustrated,the superheater elements absorb some heat by contact with and conduction from the hot gases passing through the comparments B2, but in large i* part are heated by heat radiated to the entire frontface of thesuperheater bythe hot gases V*passingthrough Ithe compartments B2. 1 It will be observed, moreover, that, while the Y superheater elements F in the central coinbusi tion chamber B have their lower ends located wator. about the level of the top ofthe cylindricallportion of thatcombustion chamber,

thereis opportunity nevertheless, for the direct radiation of heat through Ithe open end of saidcylindrical combustion chamber portion to the superheater elements as well as fromV the open ends of the cylindrical portions of the side vcombustion chambers to a level well below the tops of which thev lower ends of the corresponding 'supeiheater ele-V ments extend.l -The` described locationV of the radiant heat absorbing superheaters in-V Y Suites a relativelylarge superheatingeffect 'f with a vcomparatively small amount of superv draft loss inthe boiler. i 460! y l ofthe combustion chamber walls B4 back of them against excessive heat .absorption which heating surface-and Without adding to the The described locationof the superheating protects theportions causes burning of stays,\stay nuts, and ,when

heavily scaled, of the rear combustion cham `ber sheets.

The described location and ar- 'and lower portions VVdue to lack of circulation `of itscontained rangement of the superheaters -reduces the repairs of stay bolts, stay nuts and sheets which would otherwise be required. The vertical disposition of the superheater tubes permits of the ready and effective drainage fof the Vsupeiheaterfas a whole, when this is'required, by the simple drainage provisions il v lustrated.l The superheating eifect can be modified should this be necessary, by opening one or both ofi the valves L to allow the discharge of the small amouiitvof water into the superheater requiredto produce the; desired reduction in superheat. vThe primaryfpur pose of the piping K land L, however, :is to permit the superheatertorbe used asfaddivso V tional boiler heating surface when this is@ desirable, and particularly whentheV boiler is being heated up. .With the valves Kland Lopen, the heating upy ofthe boiler to raise steam from cold water is -hastened'bythe added and highly effective heatingv surface 'formed by the su'perheater'` and the rapidity with which the boiler can be safely heatedup is increased by the improved water `circulation in the boiler proper due to the action ofv superheater surface.v As the water in the ver-f1.

tical portions of the tubes F2 is heated up and its density therebydecreased waterisdrawn from beneath the horizontal portion of the central combustionchamber throughthe open pipe end L2 at a comparatively;ra'pidf'rate, and is `discharged at the same into the upper portion of the boiler shell through Vthe piping K; The improved water vcirculation `inthe boiler thus provided substantially increases the rapiditywithwhich-the boiler maybe 'f heatedl up without risk of the usual-severe temperature strains set uppbetween the upper ofScotch type boilers water.

Whilein accordancefwithithe provisions i of the statutes I haveV illustrated 'the-best form of my invention now known to ine, it will be apparent to those -skilled in theart that changes may be made in the forinof they apparatus disclosed without departing from the spirit of my invention as' set forth in the appended claims, and that certain features of i my invention may sometimes beused" with ada corresponding use of-other 'e vantage without features. p

Having now described myinventionpwliat I claim as new and desire fto secure by- Letters Patent is:

internal combustion chamber with'aportion of the wall thereof sepa-rated from'the|` boil-er shell b'ya portion of the water spaceoand v 125 1 stay tubes connecting -said wall portion and shell, the improvementwhich consists in a` superheater formed lof tubular elements hav# ingbody 'portions arranged to form a lining fora substantial part of said wall portion and having transversely extending-'supiso I v .l l l. In a boiler of the-type comprisingan" 'ports Connected to the body portions at intervals y along their lengths and 'extending through said stay tubes. y

2. In a boiler of the type comprising an internal combustion chamber with'a horizontal portion opening at the front of the boiler and Communicating at 'its rear end lower header to which the lower ends of said heater, a valved pipe connection from the, .v

lower header tothe boiler water space, opening into the latterv below said horizontal p0rvtion of said combustion chamber, `and* a valved connection from the upper header to the boiler opening into thelatter the water level therein. e i v Signed at New York city, in thecounty of New York and day of February, A. D. 1924.

.. JOSEPH JOHN NELIAS.

.adj acent State of New York, `thisv 26th y 

